CODEWITHSUNDEEP
c#.netxamarin.android
Andrew
Andrew

Reputation: 61

calling a .net library in xamarin

I have created a .net assembly file from the MATLAB and used it in c# windows and c# web application and its working fine. Now I want to use this assembly file in xamarin but I am getting the error. C# code should work in xamarin too. isn't it??

In windows when i tried to fetch the r,g and b channels of image its working fine but when i am trying to do the same thing in xamarin it is giving an error. windows code is as : 

int i, j;
Bitmap image = (Bitmap)pictureBox1.Image;
int width = image.Width;
int height = image.Height;
Bitmap processed_image = new Bitmap(width, height);
try
{
    byte[,,] rgb = new byte[3, height, width];
    for (i = 0; i < height; i++)
    {
        for (j = 0; j < width; j++)
        {
            rgb[0, i, j] = image.GetPixel(j, i).R;
            rgb[1, i, j] = image.GetPixel(j, i).G;
            rgb[2, i, j] = image.GetPixel(j, i).B;
        }
    }
    MWNumericArray narr = new MWNumericArray();
    narr = rgb;

    Salt obj = new Salt();
    MWArray u = obj.classification(narr);
    label1.Text = u.ToString();
   // MessageBox.Show(u.ToString());

}
catch (Exception ex)
{
    MessageBox.Show(ex.ToString());

}

and the xamarin code is as: 

int i, j;
Bitmap image = bitmapimage;// bitmapimage the image (either taken from gallery or captured using camera)

int width = image.Width;
int height = image.Height;
byte[,,] rgb = new byte[3, height, width];

for (i = 0; i < height; i++)
{ 
    for (j = 0; j < width; j++)
    {
        rgb[0, i, j] = image.GetPixel(j, i).R;
        rgb[1, i, j] = image.GetPixel(j, i).G;
        rgb[2, i, j] = image.GetPixel(j, i).B;
    }
}

MWNumericArray narr = new MWNumericArray();
narr = rgb;

Salt obj = new Salt();
MWArray u = obj.classification(narr);
textview.SetText(u);

I am getting error in fetching the R, G and B channels.

'int' does not contain a definition for 'R' and no extension method 'R' accepting a first argument of type 'int' could be found (are you missing a using directive or an assembly reference?)

Please help me to solve this error. Will be really great full. Thanks.

Upvotes: 0

Views: 83

Answers (1)

Soroush Falahati
Soroush Falahati

Reputation: 2327

It seems to me that you are using Android.Graphics.Bitmap. The GetPixel method of this object returns an int that should be converted to Android.Graphics.Color. Change your code to this:

    var color = new Android.Graphics.Color(image.GetPixel(j, i));
    rgb[0, i, j] = color.R;
    rgb[1, i, j] = color.G;
    rgb[2, i, j] = color.B;

Also, as a side note, GetPixel is slow, very slow. I suggest working with the raw binary data using Android.Graphics.Bitmap.CopyPixelsToBuffer() method. Read more here:

https://developer.xamarin.com/api/member/Android.Graphics.Bitmap.CopyPixelsToBuffer/p/Java.Nio.Buffer/

Upvotes: 1

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